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1 | /* tmp401.c |
2 | * | |
3 | * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
20 | /* | |
21 | * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC. | |
22 | * | |
23 | * Note this IC is in some aspect similar to the LM90, but it has quite a | |
24 | * few differences too, for example the local temp has a higher resolution | |
25 | * and thus has 16 bits registers for its value and limit instead of 8 bits. | |
26 | */ | |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/jiffies.h> | |
32 | #include <linux/i2c.h> | |
33 | #include <linux/hwmon.h> | |
34 | #include <linux/hwmon-sysfs.h> | |
35 | #include <linux/err.h> | |
36 | #include <linux/mutex.h> | |
37 | #include <linux/sysfs.h> | |
38 | ||
39 | /* Addresses to scan */ | |
40 | static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END }; | |
41 | ||
42 | /* Insmod parameters */ | |
43 | I2C_CLIENT_INSMOD_1(tmp401); | |
44 | ||
45 | ||
46 | /* | |
47 | * The TMP401 registers, note some registers have different addresses for | |
48 | * reading and writing | |
49 | */ | |
50 | #define TMP401_STATUS 0x02 | |
51 | #define TMP401_CONFIG_READ 0x03 | |
52 | #define TMP401_CONFIG_WRITE 0x09 | |
53 | #define TMP401_CONVERSION_RATE_READ 0x04 | |
54 | #define TMP401_CONVERSION_RATE_WRITE 0x0A | |
55 | #define TMP401_TEMP_CRIT_HYST 0x21 | |
56 | #define TMP401_CONSECUTIVE_ALERT 0x22 | |
57 | #define TMP401_MANUFACTURER_ID_REG 0xFE | |
58 | #define TMP401_DEVICE_ID_REG 0xFF | |
59 | ||
60 | static const u8 TMP401_TEMP_MSB[2] = { 0x00, 0x01 }; | |
61 | static const u8 TMP401_TEMP_LSB[2] = { 0x15, 0x10 }; | |
62 | static const u8 TMP401_TEMP_LOW_LIMIT_MSB_READ[2] = { 0x06, 0x08 }; | |
63 | static const u8 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[2] = { 0x0C, 0x0E }; | |
64 | static const u8 TMP401_TEMP_LOW_LIMIT_LSB[2] = { 0x17, 0x14 }; | |
65 | static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_READ[2] = { 0x05, 0x07 }; | |
66 | static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[2] = { 0x0B, 0x0D }; | |
67 | static const u8 TMP401_TEMP_HIGH_LIMIT_LSB[2] = { 0x16, 0x13 }; | |
68 | /* These are called the THERM limit / hysteresis / mask in the datasheet */ | |
69 | static const u8 TMP401_TEMP_CRIT_LIMIT[2] = { 0x20, 0x19 }; | |
70 | ||
71 | /* Flags */ | |
72 | #define TMP401_CONFIG_RANGE 0x04 | |
73 | #define TMP401_CONFIG_SHUTDOWN 0x40 | |
74 | #define TMP401_STATUS_LOCAL_CRIT 0x01 | |
75 | #define TMP401_STATUS_REMOTE_CRIT 0x02 | |
76 | #define TMP401_STATUS_REMOTE_OPEN 0x04 | |
77 | #define TMP401_STATUS_REMOTE_LOW 0x08 | |
78 | #define TMP401_STATUS_REMOTE_HIGH 0x10 | |
79 | #define TMP401_STATUS_LOCAL_LOW 0x20 | |
80 | #define TMP401_STATUS_LOCAL_HIGH 0x40 | |
81 | ||
82 | /* Manufacturer / Device ID's */ | |
83 | #define TMP401_MANUFACTURER_ID 0x55 | |
84 | #define TMP401_DEVICE_ID 0x11 | |
85 | ||
86 | /* | |
87 | * Functions declarations | |
88 | */ | |
89 | ||
90 | static int tmp401_probe(struct i2c_client *client, | |
91 | const struct i2c_device_id *id); | |
92 | static int tmp401_detect(struct i2c_client *client, int kind, | |
93 | struct i2c_board_info *info); | |
94 | static int tmp401_remove(struct i2c_client *client); | |
95 | static struct tmp401_data *tmp401_update_device(struct device *dev); | |
96 | ||
97 | /* | |
98 | * Driver data (common to all clients) | |
99 | */ | |
100 | ||
101 | static const struct i2c_device_id tmp401_id[] = { | |
102 | { "tmp401", tmp401 }, | |
103 | { } | |
104 | }; | |
105 | MODULE_DEVICE_TABLE(i2c, tmp401_id); | |
106 | ||
107 | static struct i2c_driver tmp401_driver = { | |
108 | .class = I2C_CLASS_HWMON, | |
109 | .driver = { | |
110 | .name = "tmp401", | |
111 | }, | |
112 | .probe = tmp401_probe, | |
113 | .remove = tmp401_remove, | |
114 | .id_table = tmp401_id, | |
115 | .detect = tmp401_detect, | |
116 | .address_data = &addr_data, | |
117 | }; | |
118 | ||
119 | /* | |
120 | * Client data (each client gets its own) | |
121 | */ | |
122 | ||
123 | struct tmp401_data { | |
124 | struct device *hwmon_dev; | |
125 | struct mutex update_lock; | |
126 | char valid; /* zero until following fields are valid */ | |
127 | unsigned long last_updated; /* in jiffies */ | |
128 | ||
129 | /* register values */ | |
130 | u8 status; | |
131 | u8 config; | |
132 | u16 temp[2]; | |
133 | u16 temp_low[2]; | |
134 | u16 temp_high[2]; | |
135 | u8 temp_crit[2]; | |
136 | u8 temp_crit_hyst; | |
137 | }; | |
138 | ||
139 | /* | |
140 | * Sysfs attr show / store functions | |
141 | */ | |
142 | ||
143 | static int tmp401_register_to_temp(u16 reg, u8 config) | |
144 | { | |
145 | int temp = reg; | |
146 | ||
147 | if (config & TMP401_CONFIG_RANGE) | |
148 | temp -= 64 * 256; | |
149 | ||
150 | return (temp * 625 + 80) / 160; | |
151 | } | |
152 | ||
153 | static u16 tmp401_temp_to_register(long temp, u8 config) | |
154 | { | |
155 | if (config & TMP401_CONFIG_RANGE) { | |
156 | temp = SENSORS_LIMIT(temp, -64000, 191000); | |
157 | temp += 64000; | |
158 | } else | |
159 | temp = SENSORS_LIMIT(temp, 0, 127000); | |
160 | ||
161 | return (temp * 160 + 312) / 625; | |
162 | } | |
163 | ||
164 | static int tmp401_crit_register_to_temp(u8 reg, u8 config) | |
165 | { | |
166 | int temp = reg; | |
167 | ||
168 | if (config & TMP401_CONFIG_RANGE) | |
169 | temp -= 64; | |
170 | ||
171 | return temp * 1000; | |
172 | } | |
173 | ||
174 | static u8 tmp401_crit_temp_to_register(long temp, u8 config) | |
175 | { | |
176 | if (config & TMP401_CONFIG_RANGE) { | |
177 | temp = SENSORS_LIMIT(temp, -64000, 191000); | |
178 | temp += 64000; | |
179 | } else | |
180 | temp = SENSORS_LIMIT(temp, 0, 127000); | |
181 | ||
182 | return (temp + 500) / 1000; | |
183 | } | |
184 | ||
185 | static ssize_t show_temp_value(struct device *dev, | |
186 | struct device_attribute *devattr, char *buf) | |
187 | { | |
188 | int index = to_sensor_dev_attr(devattr)->index; | |
189 | struct tmp401_data *data = tmp401_update_device(dev); | |
190 | ||
191 | return sprintf(buf, "%d\n", | |
192 | tmp401_register_to_temp(data->temp[index], data->config)); | |
193 | } | |
194 | ||
195 | static ssize_t show_temp_min(struct device *dev, | |
196 | struct device_attribute *devattr, char *buf) | |
197 | { | |
198 | int index = to_sensor_dev_attr(devattr)->index; | |
199 | struct tmp401_data *data = tmp401_update_device(dev); | |
200 | ||
201 | return sprintf(buf, "%d\n", | |
202 | tmp401_register_to_temp(data->temp_low[index], data->config)); | |
203 | } | |
204 | ||
205 | static ssize_t show_temp_max(struct device *dev, | |
206 | struct device_attribute *devattr, char *buf) | |
207 | { | |
208 | int index = to_sensor_dev_attr(devattr)->index; | |
209 | struct tmp401_data *data = tmp401_update_device(dev); | |
210 | ||
211 | return sprintf(buf, "%d\n", | |
212 | tmp401_register_to_temp(data->temp_high[index], data->config)); | |
213 | } | |
214 | ||
215 | static ssize_t show_temp_crit(struct device *dev, | |
216 | struct device_attribute *devattr, char *buf) | |
217 | { | |
218 | int index = to_sensor_dev_attr(devattr)->index; | |
219 | struct tmp401_data *data = tmp401_update_device(dev); | |
220 | ||
221 | return sprintf(buf, "%d\n", | |
222 | tmp401_crit_register_to_temp(data->temp_crit[index], | |
223 | data->config)); | |
224 | } | |
225 | ||
226 | static ssize_t show_temp_crit_hyst(struct device *dev, | |
227 | struct device_attribute *devattr, char *buf) | |
228 | { | |
229 | int temp, index = to_sensor_dev_attr(devattr)->index; | |
230 | struct tmp401_data *data = tmp401_update_device(dev); | |
231 | ||
232 | mutex_lock(&data->update_lock); | |
233 | temp = tmp401_crit_register_to_temp(data->temp_crit[index], | |
234 | data->config); | |
235 | temp -= data->temp_crit_hyst * 1000; | |
236 | mutex_unlock(&data->update_lock); | |
237 | ||
238 | return sprintf(buf, "%d\n", temp); | |
239 | } | |
240 | ||
241 | static ssize_t show_status(struct device *dev, | |
242 | struct device_attribute *devattr, char *buf) | |
243 | { | |
244 | int mask = to_sensor_dev_attr(devattr)->index; | |
245 | struct tmp401_data *data = tmp401_update_device(dev); | |
246 | ||
247 | if (data->status & mask) | |
248 | return sprintf(buf, "1\n"); | |
249 | else | |
250 | return sprintf(buf, "0\n"); | |
251 | } | |
252 | ||
253 | static ssize_t store_temp_min(struct device *dev, struct device_attribute | |
254 | *devattr, const char *buf, size_t count) | |
255 | { | |
256 | int index = to_sensor_dev_attr(devattr)->index; | |
257 | struct tmp401_data *data = tmp401_update_device(dev); | |
258 | long val; | |
259 | u16 reg; | |
260 | ||
261 | if (strict_strtol(buf, 10, &val)) | |
262 | return -EINVAL; | |
263 | ||
264 | reg = tmp401_temp_to_register(val, data->config); | |
265 | ||
266 | mutex_lock(&data->update_lock); | |
267 | ||
268 | i2c_smbus_write_byte_data(to_i2c_client(dev), | |
269 | TMP401_TEMP_LOW_LIMIT_MSB_WRITE[index], reg >> 8); | |
270 | i2c_smbus_write_byte_data(to_i2c_client(dev), | |
271 | TMP401_TEMP_LOW_LIMIT_LSB[index], reg & 0xFF); | |
272 | ||
273 | data->temp_low[index] = reg; | |
274 | ||
275 | mutex_unlock(&data->update_lock); | |
276 | ||
277 | return count; | |
278 | } | |
279 | ||
280 | static ssize_t store_temp_max(struct device *dev, struct device_attribute | |
281 | *devattr, const char *buf, size_t count) | |
282 | { | |
283 | int index = to_sensor_dev_attr(devattr)->index; | |
284 | struct tmp401_data *data = tmp401_update_device(dev); | |
285 | long val; | |
286 | u16 reg; | |
287 | ||
288 | if (strict_strtol(buf, 10, &val)) | |
289 | return -EINVAL; | |
290 | ||
291 | reg = tmp401_temp_to_register(val, data->config); | |
292 | ||
293 | mutex_lock(&data->update_lock); | |
294 | ||
295 | i2c_smbus_write_byte_data(to_i2c_client(dev), | |
296 | TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[index], reg >> 8); | |
297 | i2c_smbus_write_byte_data(to_i2c_client(dev), | |
298 | TMP401_TEMP_HIGH_LIMIT_LSB[index], reg & 0xFF); | |
299 | ||
300 | data->temp_high[index] = reg; | |
301 | ||
302 | mutex_unlock(&data->update_lock); | |
303 | ||
304 | return count; | |
305 | } | |
306 | ||
307 | static ssize_t store_temp_crit(struct device *dev, struct device_attribute | |
308 | *devattr, const char *buf, size_t count) | |
309 | { | |
310 | int index = to_sensor_dev_attr(devattr)->index; | |
311 | struct tmp401_data *data = tmp401_update_device(dev); | |
312 | long val; | |
313 | u8 reg; | |
314 | ||
315 | if (strict_strtol(buf, 10, &val)) | |
316 | return -EINVAL; | |
317 | ||
318 | reg = tmp401_crit_temp_to_register(val, data->config); | |
319 | ||
320 | mutex_lock(&data->update_lock); | |
321 | ||
322 | i2c_smbus_write_byte_data(to_i2c_client(dev), | |
323 | TMP401_TEMP_CRIT_LIMIT[index], reg); | |
324 | ||
325 | data->temp_crit[index] = reg; | |
326 | ||
327 | mutex_unlock(&data->update_lock); | |
328 | ||
329 | return count; | |
330 | } | |
331 | ||
332 | static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute | |
333 | *devattr, const char *buf, size_t count) | |
334 | { | |
335 | int temp, index = to_sensor_dev_attr(devattr)->index; | |
336 | struct tmp401_data *data = tmp401_update_device(dev); | |
337 | long val; | |
338 | u8 reg; | |
339 | ||
340 | if (strict_strtol(buf, 10, &val)) | |
341 | return -EINVAL; | |
342 | ||
343 | if (data->config & TMP401_CONFIG_RANGE) | |
344 | val = SENSORS_LIMIT(val, -64000, 191000); | |
345 | else | |
346 | val = SENSORS_LIMIT(val, 0, 127000); | |
347 | ||
348 | mutex_lock(&data->update_lock); | |
349 | temp = tmp401_crit_register_to_temp(data->temp_crit[index], | |
350 | data->config); | |
351 | val = SENSORS_LIMIT(val, temp - 255000, temp); | |
352 | reg = ((temp - val) + 500) / 1000; | |
353 | ||
354 | i2c_smbus_write_byte_data(to_i2c_client(dev), | |
355 | TMP401_TEMP_CRIT_HYST, reg); | |
356 | ||
357 | data->temp_crit_hyst = reg; | |
358 | ||
359 | mutex_unlock(&data->update_lock); | |
360 | ||
361 | return count; | |
362 | } | |
363 | ||
364 | static struct sensor_device_attribute tmp401_attr[] = { | |
365 | SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0), | |
366 | SENSOR_ATTR(temp1_min, 0644, show_temp_min, store_temp_min, 0), | |
367 | SENSOR_ATTR(temp1_max, 0644, show_temp_max, store_temp_max, 0), | |
368 | SENSOR_ATTR(temp1_crit, 0644, show_temp_crit, store_temp_crit, 0), | |
369 | SENSOR_ATTR(temp1_crit_hyst, 0644, show_temp_crit_hyst, | |
370 | store_temp_crit_hyst, 0), | |
371 | SENSOR_ATTR(temp1_min_alarm, 0444, show_status, NULL, | |
372 | TMP401_STATUS_LOCAL_LOW), | |
373 | SENSOR_ATTR(temp1_max_alarm, 0444, show_status, NULL, | |
374 | TMP401_STATUS_LOCAL_HIGH), | |
375 | SENSOR_ATTR(temp1_crit_alarm, 0444, show_status, NULL, | |
376 | TMP401_STATUS_LOCAL_CRIT), | |
377 | SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1), | |
378 | SENSOR_ATTR(temp2_min, 0644, show_temp_min, store_temp_min, 1), | |
379 | SENSOR_ATTR(temp2_max, 0644, show_temp_max, store_temp_max, 1), | |
380 | SENSOR_ATTR(temp2_crit, 0644, show_temp_crit, store_temp_crit, 1), | |
381 | SENSOR_ATTR(temp2_crit_hyst, 0444, show_temp_crit_hyst, NULL, 1), | |
382 | SENSOR_ATTR(temp2_fault, 0444, show_status, NULL, | |
383 | TMP401_STATUS_REMOTE_OPEN), | |
384 | SENSOR_ATTR(temp2_min_alarm, 0444, show_status, NULL, | |
385 | TMP401_STATUS_REMOTE_LOW), | |
386 | SENSOR_ATTR(temp2_max_alarm, 0444, show_status, NULL, | |
387 | TMP401_STATUS_REMOTE_HIGH), | |
388 | SENSOR_ATTR(temp2_crit_alarm, 0444, show_status, NULL, | |
389 | TMP401_STATUS_REMOTE_CRIT), | |
390 | }; | |
391 | ||
392 | /* | |
393 | * Begin non sysfs callback code (aka Real code) | |
394 | */ | |
395 | ||
396 | static void tmp401_init_client(struct i2c_client *client) | |
397 | { | |
398 | int config, config_orig; | |
399 | ||
400 | /* Set the conversion rate to 2 Hz */ | |
401 | i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5); | |
402 | ||
403 | /* Start conversions (disable shutdown if necessary) */ | |
404 | config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ); | |
405 | if (config < 0) { | |
406 | dev_warn(&client->dev, "Initialization failed!\n"); | |
407 | return; | |
408 | } | |
409 | ||
410 | config_orig = config; | |
411 | config &= ~TMP401_CONFIG_SHUTDOWN; | |
412 | ||
413 | if (config != config_orig) | |
414 | i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config); | |
415 | } | |
416 | ||
417 | static int tmp401_detect(struct i2c_client *client, int kind, | |
418 | struct i2c_board_info *info) | |
419 | { | |
420 | struct i2c_adapter *adapter = client->adapter; | |
421 | ||
422 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
423 | return -ENODEV; | |
424 | ||
425 | /* Detect and identify the chip */ | |
426 | if (kind <= 0) { | |
427 | u8 reg; | |
428 | ||
429 | reg = i2c_smbus_read_byte_data(client, | |
430 | TMP401_MANUFACTURER_ID_REG); | |
431 | if (reg != TMP401_MANUFACTURER_ID) | |
432 | return -ENODEV; | |
433 | ||
434 | reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG); | |
435 | if (reg != TMP401_DEVICE_ID) | |
436 | return -ENODEV; | |
437 | ||
438 | reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ); | |
439 | if (reg & 0x1b) | |
440 | return -ENODEV; | |
441 | ||
442 | reg = i2c_smbus_read_byte_data(client, | |
443 | TMP401_CONVERSION_RATE_READ); | |
444 | if (reg > 15) | |
445 | return -ENODEV; | |
446 | } | |
447 | strlcpy(info->type, "tmp401", I2C_NAME_SIZE); | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | static int tmp401_probe(struct i2c_client *client, | |
453 | const struct i2c_device_id *id) | |
454 | { | |
455 | int i, err = 0; | |
456 | struct tmp401_data *data; | |
457 | ||
458 | data = kzalloc(sizeof(struct tmp401_data), GFP_KERNEL); | |
459 | if (!data) | |
460 | return -ENOMEM; | |
461 | ||
462 | i2c_set_clientdata(client, data); | |
463 | mutex_init(&data->update_lock); | |
464 | ||
465 | /* Initialize the TMP401 chip */ | |
466 | tmp401_init_client(client); | |
467 | ||
468 | /* Register sysfs hooks */ | |
469 | for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) { | |
470 | err = device_create_file(&client->dev, | |
471 | &tmp401_attr[i].dev_attr); | |
472 | if (err) | |
473 | goto exit_remove; | |
474 | } | |
475 | ||
476 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
477 | if (IS_ERR(data->hwmon_dev)) { | |
478 | err = PTR_ERR(data->hwmon_dev); | |
479 | data->hwmon_dev = NULL; | |
480 | goto exit_remove; | |
481 | } | |
482 | ||
483 | dev_info(&client->dev, "Detected TI TMP401 chip\n"); | |
484 | ||
485 | return 0; | |
486 | ||
487 | exit_remove: | |
488 | tmp401_remove(client); /* will also free data for us */ | |
489 | return err; | |
490 | } | |
491 | ||
492 | static int tmp401_remove(struct i2c_client *client) | |
493 | { | |
494 | struct tmp401_data *data = i2c_get_clientdata(client); | |
495 | int i; | |
496 | ||
497 | if (data->hwmon_dev) | |
498 | hwmon_device_unregister(data->hwmon_dev); | |
499 | ||
500 | for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) | |
501 | device_remove_file(&client->dev, &tmp401_attr[i].dev_attr); | |
502 | ||
503 | kfree(data); | |
504 | return 0; | |
505 | } | |
506 | ||
507 | static struct tmp401_data *tmp401_update_device(struct device *dev) | |
508 | { | |
509 | struct i2c_client *client = to_i2c_client(dev); | |
510 | struct tmp401_data *data = i2c_get_clientdata(client); | |
511 | int i; | |
512 | ||
513 | mutex_lock(&data->update_lock); | |
514 | ||
515 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
516 | data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS); | |
517 | data->config = i2c_smbus_read_byte_data(client, | |
518 | TMP401_CONFIG_READ); | |
519 | for (i = 0; i < 2; i++) { | |
520 | /* High byte must be read first immediately followed | |
521 | by the low byte */ | |
522 | data->temp[i] = i2c_smbus_read_byte_data(client, | |
523 | TMP401_TEMP_MSB[i]) << 8; | |
524 | data->temp[i] |= i2c_smbus_read_byte_data(client, | |
525 | TMP401_TEMP_LSB[i]); | |
526 | data->temp_low[i] = i2c_smbus_read_byte_data(client, | |
527 | TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8; | |
528 | data->temp_low[i] |= i2c_smbus_read_byte_data(client, | |
529 | TMP401_TEMP_LOW_LIMIT_LSB[i]); | |
530 | data->temp_high[i] = i2c_smbus_read_byte_data(client, | |
531 | TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8; | |
532 | data->temp_high[i] |= i2c_smbus_read_byte_data(client, | |
533 | TMP401_TEMP_HIGH_LIMIT_LSB[i]); | |
534 | data->temp_crit[i] = i2c_smbus_read_byte_data(client, | |
535 | TMP401_TEMP_CRIT_LIMIT[i]); | |
536 | } | |
537 | ||
538 | data->temp_crit_hyst = i2c_smbus_read_byte_data(client, | |
539 | TMP401_TEMP_CRIT_HYST); | |
540 | ||
541 | data->last_updated = jiffies; | |
542 | data->valid = 1; | |
543 | } | |
544 | ||
545 | mutex_unlock(&data->update_lock); | |
546 | ||
547 | return data; | |
548 | } | |
549 | ||
550 | static int __init tmp401_init(void) | |
551 | { | |
552 | return i2c_add_driver(&tmp401_driver); | |
553 | } | |
554 | ||
555 | static void __exit tmp401_exit(void) | |
556 | { | |
557 | i2c_del_driver(&tmp401_driver); | |
558 | } | |
559 | ||
560 | MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); | |
561 | MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver"); | |
562 | MODULE_LICENSE("GPL"); | |
563 | ||
564 | module_init(tmp401_init); | |
565 | module_exit(tmp401_exit); |